25402217 has 2 divisors, whose sum is σ = 25402218. Its totient is φ = 25402216.

The previous prime is 25402193. The next prime is 25402229. The reversal of 25402217 is 71220452.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13402921 + 11999296 = 3661^2 + 3464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25402217 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25402192 and 25402201.

It is not a weakly prime, because it can be changed into another prime (25402417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12701108 + 12701109.

It is an arithmetic number, because the mean of its divisors is an integer number (12701109).

Almost surely, 2^25402217 is an apocalyptic number.

It is an amenable number.

25402217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25402217 is an equidigital number, since it uses as much as digits as its factorization.

25402217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 25402217 is about 5040.0612099458. The cubic root of 25402217 is about 293.9615580570.

Adding to 25402217 its reverse (71220452), we get a palindrome (96622669).

The spelling of 25402217 in words is "twenty-five million, four hundred two thousand, two hundred seventeen".